The announcement of a 100% tariff on foreign-made movies could lead to a trade war, increased costs for consumers, and retaliatory measures from other countries, ultimately affecting the stock market. Historically, Trump's protectionist policies have led to market volatility and decreased investor confidence. The movie industry, in particular, has a significant impact on the US economy, with many publicly traded companies involved in film production and distribution. A tariff on foreign movies could lead to higher costs for these companies, potentially affecting their stock prices. Furthermore, the broader implications of a trade war could lead to a decline in investor confidence, causing a negative impact on the overall stock market. The technology and media sectors, in particular, may be affected, as they have significant exposure to international trade and global markets.